a = 21
b = 10
c = 0
c = a + b
print('(1)c的值为', c)
c += a
print('(2)c的值为', c)
c *= a
print('(3)c的值为', c)
c /= a
print('(4)c的值为', c)

c = 2
c %= a
print('(5)c的值为', c)
c **= a
print('(6)c的值为', c)
c //= a
print('(7)c的值为', c)
